S peters co



(No Model.)

C. C. GERLACH.

BLBGTROMAGNBT.

Patented Nov. 13, 1894.

ih/mf UNITED STATES PATENT Y' OFFICE.

OARL o. eERLAen, OF OLEVELAND, OH1o,'Assio.NoR OF ONE-HALF rro RUDOLPHP. eERLAoI-i, OF sAME PLAGE.

ELECT ROMAG N ET.

SPECIFICATION forming part of Letters Patent No. 529,325, dated November13, 1894.`

Application filed December 9,1893. Serial No. l93,2l2. (No model.)

To a/ZZ whom it may concern.-

Be it known that I, CARL C. GERLAOH, a citizen of the United States, anda resident of C1eveland, countyof Cuyahoga, State of Ohio, have inventedcertain new and useful Im-v provements in Insulation, of which I herebydeclare the following to be a full, clear, and exact description, suchas will enable others skilled in the art to which the inventionappertains to make and use the same.

My invention relates to improvements in insulation for electro-magnetcoils and its objects are to provide absolute insulation between thestrands of wire wound upon the magnet core, and at the same time obviateall possibility of short circuiting or burning out of the coil. I attainthese objects by means ofthe peculiar method of winding hereinafterdescribed, shown in the accompanying drawings and more specificallypointed out in the claim.

In the accompanying drawings Figure 1 is a central sectional view of amagnet showing one form of winding. Fig. 2 is asimilar view illustratinga second variety. Fig. 3 is a detail view of wires on the exterior ofthe coil showing their relation when wound in position upon a magnet.Figl is a detail of one wire similarly insulated.

In the figures A is the core piece of a magnet. B, B, are the strands ofthe winding coil. C is the insulation of fibrous thread. D is aninsulating filling of hard or plastic material.

D represents the air space between the strands when separated by thewound ber; in other words the air insulation.

5 In the detail figures the insulating fiber is shown as wounddiagonally in open spiral about the wire, some distance being leftloethis method of winding no two wires in the coil on the magnet can bebrought close enough together to come in contact at any point, nor

will the insulation at any point be found close enough to prevent freeair circulation through every portion of the coil. It is obvious that noheating of the core could take place with such ventilation, nor couldthe current be short circuited between the coils of wire.

A second form of insulation may be employed for some purposes, namely, afilling of hard insulating substance between the strands, such ascement, &c. The advantages of this addition will be found in case oftire when the coil will be so well protected that no amount of heatcould destroy its operative power; also by the use of theinsulatingilling deposits may be prevented in the"- coil of dust orother rubbish. It will be seen that the same result could beaccomplished by means of a circular insulating coil placed at intervalsuponA the wires, but sufficiently near to prevent adjacent wires fromtouching.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is-

A magnet coil consisting in a series of coils of wire the surface ofwhich is partially wound with flexible non-conducting material, in sucha manner as to present alternately the covered and bare wire, and t0admit an insulating medium between the strands, substantially as setforth.

CARL C. GERLACH.

Witnesses:

WM. M. MONROE, E. C. GREEN. "if

tween the strands, and it will be seen that with

